Wireless telegraphy.



R. A. FESSBNDEN. WIRELESS TELEGRAPHY. APPLICATION FILED JUL'Y19,1909.

1,035,384. Patented Aug. 13,1912.

Q1 INVENTOR.

UNTE STATS UFFIQE.

REGINALD A. FESSENDEN, 0F BRANT ROCK, MASSACHUSETTS, .ASSIGNOR T0NATIONAL ELECTRIC SIGNALING COMPANY, 0F PI T1011 OF NEW JERSEY.

TTSBURGH, PENNSYLVANIA, A CORPORA- WIRELESS 'TELEGRAPHY.

Patented Aug. 13,1912.

Application filed July 19, 1909. Serial No. 508,442.

To all whom it may concern Be it known that I, REGINALD A. Fnssnw- DEN,a citizen of the United States, residing at Brant. Rock, in the countyof Plymouth and State'ot Massachusetts, have invented certain new anduseful Improvements in i Vireless Telegraphy, of which the following isa specification.

My invention relates to the art of transmitting energy by electricaloscillations and more particularly to wireless telegraphy, and itsprimary object is the more eilicient transmission and receipt of energyby electrical oscillations and more particularly the prevention of lossfrom absorp tion and shielding in transmitting and receiving signals bywireless telegra ihy.

In the accompanying drawing owning a part of this specification thefigure shows a sectional view illustrating apparatus for accomplishingthe purpose of my invent ion.

This invention is particularly adapted for use where it is desired tolocate wireless aparatus within an inclosure having walls of iron orsimilar material and especially on board battleships where it is desiredto locate the Wireless apparatus below the protective deck. Herctotorethis has been found impossible, the signals produced and received whenthe apparatus is placed below the protective deck on war vessels or in asimilar situation on other vessels being rendered so weak as to preventsatisfactory working over any considerable distance. As the result ofnumerous investigations I have (llSCOVQ-IOdtlitlt this weakening isprobably due to hysteresis or eddy-current losses set up inthe steeldecks or passages through which the wireless leads pass. I havedetermined by experiment that 'n'ierely bringing a wireless lead withina tuv feet-from a steel plate for a range five or ten feet has a veryconsiderable effect. on weakening the signals. As the result of numerousadditional experiments I have discovered that this weakening can beovercome by surrounding the leads with a tube of conducting material,integral or slotted, which tube is preferably formed of copper orsilicon bronze and surroundsthe antenna lead orany of the other wirelessconductors where they pass through a steel wall or ,in proximity to awall of steel or similar absorbing material.

In the figure 11 is a compartment of a vessel, 12 being the protectivedeck and 13 an upper deck.

14 is the water line, 15, 16 are masts for supporting the antenna, 17,17, 17 is an antenna formed oi a number of parallel wires arrangedin'thc shape of an inverted triangle.

18 is the lead from the antenna.

22 is-a high 't'requcncy dynamo and 23 is a receiver.

21 is a switch for connecting the lead 18 either to the high frequencydynamo or to the receiver.

20 is a tube of copper, for example two feet in diameter, which may beintegral or slotted as shown for example at 29.

1t), 19 are insulators supporting the lead 18 in the center of the tube20.

The wireless apparatus may be grounded directly to the frame oi the shipas shown at 22-3 or a switch may be employed as shown at $24 by whichtln apparatus may be connected either directly to the frame of the shipor to some conductor running through the walls of the vessel, forexample to the copper tube 20 by the lead 25 as shown. The copper tube20 is also preferably arranged as shown, so that by the throwing of theswitch 26 it may be connected to a copper tube 27 which runs over theoutside of the vessel and is connected to the copper sheathing on theoutside of the vessel as shown at I have experimentally found that bythe use of this invention the ditticulties heretofore met with areovercome and the signals are transmitted and received with practic'allytheir full intensity. The tuning which was formerly very poor, when thesharp. As an illustration the U. S.

Connecticut lying in the Brooklyn Navy Yard was able to receive signalsfrom Brantllock, ltlassachusetts, at practically undiminished strength,while at the same time entirely cutting out the disturbingsignals fromthe station at the Brooklyn Navy Yard so that they could not be heard atall.

Having thus described my invention and illustrated its use, 1 claim asnew and dcsire to protect by Letters Patent the followln z V Thecombination with wireless telegmph apparatus, 3113 an ineioeure for saidapparatus made of energy absorbing inuterml, of a )rotecting sheathbetween the conductors o the apparatus and the energy absorbing materialcomposed of a nonubsorbing conductor.

2. The combination with an iron battleship or like inciosure ofapparatus for Wireless signaiing including a'conductor enteriug saldinelosure, and a shield of non-absorbing conductor material around saidconductor where it passes through or is in proximifiy to the iron of theship.

'3, The combination with an iron ship or like inciosure, of wirelesssignaling appa- 15 JESSIE E. BENT, FLORENCE M. LYON.

